Call operator for objc.ObjCBlock<ffi.Bool Function(ffi.Pointer<ffi.Void>, NSWindow)>.
objc.ObjCBlock<ffi.Bool Function(ffi.Pointer<ffi.Void>, NSWindow)>
Available on ObjCBlock<Bool Function(Pointer<Void>, NSWindow)>, provided by the ObjCBlock_bool_ffiVoid_NSWindow_CallExtension extension